Improvement in cultivators



1. R. M DONALDQ r Cultivators.

No.137,703, PatentedApril8,1873

Fi i.

L2 Me n 2-0 7 -w' ba UNITED STATES PATENT OFFICE.

JAMES R. MCDONALD, OF NEVADA, IOWA.

IMPROVEMENT IN CULTIVATORS.

Specification forming part of Letters Patent N 0. 137,703., dated April8, 1873; application filed September 14, 1872.

To all whom it may concern:

Be it known that I, JAMES R. MCDONALD, of Nevada, in the county of Storyand State of Iowa, have invented a new and valuable ImprovementinCorn-Cultivators; and I do hereby declare that the following is a full,clear, and exact description of the construction and operation of thesame, reference being had to the annexed drawing making a part of thisspecification, and to the letters and figures of reference markedthereon.

Figure l of the drawing is a representation of a vertical section of myinvention. Fig. 2 is a top view of my invention. Fig. 3 is a detail ofthe same.

This invention has relation to the frames of wheel-cultivators, and itconsists in the construction and novel arrangement of the bent axle, theslotted pole, and, in connection therewith, of the equalizing devices,all hereinafter more particularly described.

In the accompanying drawing, the letter A designates the wheels of asulky-cultivator; B, the plow beams, connected by suitable clips to thehorizontal portions of the bent axle G. D indicates the pole slotted ata in its rear end, and connected by means of the adjustable bolt b,which passes through this slot, with the middle bend of the axle. Erepresents the whiffletree pivoted to the pole in front of the slot a.The letters a indicate pivoted brace-rods extending from the sides ofthe tongue or pole to the horizontal portions of the axle, andconnecting the same. Bent and perforated draft plates 0 are securelypivoted at their lower ends to the front ends of the plow-beams, theirupper ends being connected to the ends of the whiffletree by links y,chains, or other suitable connecting devices, which will allow theplates 0 to swing forward, rearward, or laterally, as may be required bythe adjustment of the bent axle and the plow-beams. The letter Hdesignates the single-trees, which are respectively attached to theplates 0 by suitable hooks d, which may be adjusted in the perforationsof said plates, according to the heights of the horses. The axle O isprovided with an upward bend, e, in its middle portion, to which thepole or tongue is connected, as above described. It is also provided atits ends with the cranks or bent arms h, to which the wheels arejournaled. The angular position of the middle bend c with relation tothe end cranks h and the brace-rods a, and its length in proportionthereto, are designed to be such that the distance of the tongue or polevertically above the wheels will be about the same whatever be theadjustment of the bent axle and the consequent change inthe relativeheight of the plow-beams. The plow-beams are set for deep plowing byadjusting the middle bend e of the axle forward with relation to thepole, and thereby rotating upward the end cranks h to which the wheelsare journaled, At the same time the, line of draft is lowered, thesingle-trees being depressed by the alteration in the position of thedraft -bars 0. The plow-beams are set for shallow work by adjusting themiddle bend e of the axle rearward, thereby rotating downward theendcranks h to which the wheels are journaled, andraising relatively theplow-beams at the same time the line of draft is raised, thesingle-trees being elevated by the change in the position of thedraft-bars. In the adjustment for deep plowing the plow-beams arebrought somewhat forward, closer to the horses.

What I claim as my invention, and desire to secure by Letters Patent, is

In a cultivator, the combination, with the adjustable pole, theplow-beams, and the pivoted brace-rods, of the adjustable axle bentupward at e to connect with the pole, and relatively downward andoutward at h to receive the wheels, substantially as specified.

In testimony that I claim the above I have hereunto subscribed my namein the presence of two witnesses.

JAMES R. MCDONALD.

Witnesses:

J. L. DANA, S. F. BALLJET.

